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Old 10-09-2017   #31
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Re: air filter mod

Hi,
Yes, the electrical unit on the end of the common rail is the high pressure sensor. All a box connected between this and the connector that was plugged in can do is reduce the signal from the sensor. The ECU then thinks the fuel pressure is low and adjusts the regulator to bring the signal up to the proper level. The real fuel pressure is now higher than it should be. This causes more fuel to be injected than the ECU has demanded. Immediate effect is apparently more power, but there are other effects. It's a complex interaction as the ECU is also measuring the lambda sensor(s), MAF etc.

Robert G8RPI.
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Old 10-09-2017   #32
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Re: air filter mod

it is what it is now.tnx for explanation.
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